The Circular Ocean #ChemHack Challenge took place as part of the 17th European Meeting on Environmental Chemistry (EMEC17) on 29th November 2016, organised by the Environmental Research Institute (ERI), North Highland College, part of the University of the Highlands and Islands (UHI). The aim of the #ChemHack Challenge was to develop innovative solutions to ‘end of life’ problems associated with contaminated fishing nets and ropes (FNRs), specifically: